what would you do?

my brother and sister in law to be have put me in a rehab centre for crystal meth use,its all because of her, she comes from a perfect family with no problems and her and my brother have the perfect life. they have money live in a huge house have the perfect relationship and now a baby on the way. i have begged them to come get me out and they say no. i think they just want me out the way. my brother says they arent being manipulated anymore and either i get my act straight or get lost. its all her, she is putting ideas in his head. how do i get him to see this.